Factual error: Saroo is in Melbourne in 2008 (as indicated by the text at the beginning of the scene). As Saroo and Lucy walk down the street on opposite sides, a red Nissan Qashqai is seen driving past. That car didn't come out until 2013.
Continuity mistake: When young Saroo is taken to the flat for food and drink by the woman, the level of liquid in the bottle of soda changes from shot to shot.
Factual error: In one of the train carriages there are mobile phone charging points which were not available in the mid 1980s.